Patents by Inventor Hisayu Osawa

Hisayu Osawa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Polymer composition containing a piperidyl-triazine compound
    Patent number: 5486556
    Abstract: A polymer composition comprising a polymer stabilized against the effects of light and heat by the incorporation of a polymer stabilizer, wherein the polymer stabilizer comprises at least one compound selected from the group consisting of compounds of formula (I): ##STR1## wherein R.sup.1 is hydrogen, alkyl, alkoxyalkyl, carboxylic acyl or phenylalkyl, or an optionally substituted tetramethylpiperidyl group; R.sup.2 is hydrogen, alkyl, carboxylic acyl or phenylalkyl group; R.sup.3 is alkylene optionally interrupted by at least one oxygen atom; X is oxygen or --NR.sup.5 --, wherein R.sup.
    Type: Grant
    Filed: May 2, 1995
    Date of Patent: January 23, 1996
    Assignee: Sankyo Company, Limited
    Inventors: Toshimasa Toda, Satoru Naito, Hisayu Osawa, Takaaki Yamazaki
  • Piperidyl-triazine derivatives and their use as polymer stabilizers
    Patent number: 5446144
    Abstract: A compound of formula (I): ##STR1## wherein: R.sup.1 is hydrogen, alkyl, alkoxyalkyl, carboxylic acyl or phenylalkyl, or an optionally substituted tetramethylpiperidyl group: R.sup.2 is hydrogen, alkyl, carboxylic acyl or phenylalkyl group; R.sup.3 is alkylene optionally interrupted by at least one oxygen atom X is oxygen or --NR.sup.5 --; wherein R.sup.5 is hydrogen or alkyl,: Y is --OCO--, --COO--, --CONH-- or --OCONH--; n is 2 to 4; and, when n is 2, Z is alkylene optionally interrupted by at least one oxygen, sulfur or aryl, cycloalkyl or heterocyclic group, or, when n is 3, Z is alkanetriyl in which a carbon is optionally replaced by nitrogen or, when n is 4, Z is alkanetetrayl optionally interrupted by at least one oxygen atom and acid addition salts thereof are valuable polymer stabilizers.
    Type: Grant
    Filed: February 2, 1990
    Date of Patent: August 29, 1995
    Assignee: Sankyo Company, Limited
    Inventors: Toshimasa Toda, Satoru Naito, Hisayu Osawa, Takaaki Yamazaki
  • Resistant resin compositions
    Patent number: 5096948
    Abstract: The present invention relates to weather resistant resin compositions consisting essentially of at least one polymeric substance and comprising discoloration effective amounts of:(i) a hindered amine stabilizer;(ii) a hindered-phenol-hindered amine stabilizer; and(iii) a UV absorber.
    Type: Grant
    Filed: June 22, 1990
    Date of Patent: March 17, 1992
    Assignees: Sankyo Company, Limited, Monsanto Kasei Company
    Inventors: Tomoyuki Kurumada, Hisayu Osawa, Toshimasa Toda, Hiromi Tomono, Ryuichi Hasegawa